function highlight(id)
{
	if (document.getElementById) {

		var el1 = document.getElementById('concept');
		var el2 = document.getElementById('interest');
		var el3 = document.getElementById('redevelopment');
		var el4 = document.getElementById('vision');

		var el5 = document.getElementById('concept_title');
		var el6 = document.getElementById('interest_title');
		var el7 = document.getElementById('redevelopment_title');
		var el8 = document.getElementById('vision_title');

		if (id == 'concept') {
			el2.style.color = '#e5e5e5';
			el3.style.color = '#e5e5e5';
			el4.style.color = '#e5e5e5';

			el6.style.color = '#e5e5e5';
			el7.style.color = '#e5e5e5';
			el8.style.color = '#e5e5e5';
			
			MM_swapImage(interest_img,'',project_dir + interest_img_dim,1)
			MM_swapImage(redevelopment_img,'',project_dir + redevelopment_img_dim,1)
			MM_swapImage(vision_img,'',project_dir + vision_img_dim,1)
		}
		else if (id == 'interest') {
			el1.style.color = '#e5e5e5';
			el3.style.color = '#e5e5e5';
			el4.style.color = '#e5e5e5';

			el5.style.color = '#e5e5e5';
			el7.style.color = '#e5e5e5';
			el8.style.color = '#e5e5e5';
			
			MM_swapImage(concept_img,'',project_dir + concept_img_dim,1)
			MM_swapImage(redevelopment_img,'',project_dir + redevelopment_img_dim,1)
			MM_swapImage(vision_img,'',project_dir + vision_img_dim,1)
		}
		else if (id == 'redevelopment') {
			el1.style.color = '#e5e5e5';
			el2.style.color = '#e5e5e5';
			el4.style.color = '#e5e5e5';

			el5.style.color = '#e5e5e5';
			el6.style.color = '#e5e5e5';
			el8.style.color = '#e5e5e5';
			
			MM_swapImage(concept_img,'',project_dir + concept_img_dim,1)
			MM_swapImage(interest_img,'',project_dir + interest_img_dim,1)
			MM_swapImage(vision_img,'',project_dir + vision_img_dim,1)
		}
		else if (id == 'vision') {
			el1.style.color = '#e5e5e5';
			el2.style.color = '#e5e5e5';
			el3.style.color = '#e5e5e5';

			el5.style.color = '#e5e5e5';
			el6.style.color = '#e5e5e5';
			el7.style.color = '#e5e5e5';
			
			MM_swapImage(concept_img,'',project_dir + concept_img_dim,1)
			MM_swapImage(interest_img,'',project_dir + interest_img_dim,1)
			MM_swapImage(redevelopment_img,'',project_dir + redevelopment_img_dim,1)
		}
	}
}

function unhighlight($img)
{
	var el1 = document.getElementById('concept');
	var el2 = document.getElementById('interest');
	var el3 = document.getElementById('redevelopment');
	var el4 = document.getElementById('vision');

	var el5 = document.getElementById('concept_title');
	var el6 = document.getElementById('interest_title');
	var el7 = document.getElementById('redevelopment_title');
	var el8 = document.getElementById('vision_title');

	if (document.getElementById) {
		el1.style.color = 'black';
		el2.style.color = 'black';
		el3.style.color = 'black';
		el4.style.color = 'black';

		el5.style.color = '#681D20';
		el6.style.color = '#681D20';
		el7.style.color = '#681D20';
		el8.style.color = '#681D20';

		MM_swapImage(concept_img,'',project_dir + concept_img_on,1)
		MM_swapImage(interest_img,'',project_dir + interest_img_on,1)
		MM_swapImage(redevelopment_img,'',project_dir + redevelopment_img_on,1)
		MM_swapImage(vision_img,'',project_dir + vision_img_on,1)
	}
}